A5019989632- Microwave and Dielectric Measurement Techniques
- Microwave Engineering and Waveguides
- Non-Invasive Vital Sign Monitoring
- Antenna Design and Analysis
- Acoustic Wave Resonator Technologies
- Advanced Antenna and Metasurface Technologies
- Radio Frequency Integrated Circuit Design
- Electromagnetic Compatibility and Measurements
- Energy Harvesting in Wireless Networks
- Antenna Design and Optimization
- Indoor and Outdoor Localization Technologies
- Power Line Communications and Noise
- Electromagnetic Compatibility and Noise Suppression
- Healthcare Technology and Patient Monitoring
- Wireless Power Transfer Systems
- Hemodynamic Monitoring and Therapy
- ECG Monitoring and Analysis
- Advanced Fiber Optic Sensors
- Sensor Technology and Measurement Systems
- Bat Biology and Ecology Studies
- Advanced MEMS and NEMS Technologies
- Millimeter-Wave Propagation and Modeling
- Phonocardiography and Auscultation Techniques
- Advancements in PLL and VCO Technologies
- Bluetooth and Wireless Communication Technologies
Universität Hamburg
2020-2025
Hamburg University of Technology
2020-2025
Brandenburg University of Technology Cottbus-Senftenberg
2017-2023
Friedrich-Alexander-Universität Erlangen-Nürnberg
2011-2021
Texas Tech University
2021
Siemens (Germany)
2017-2020
University of Perugia
2019
National Research Council
2019
Institute of Electronics, Computer and Telecommunication Engineering
2019
Technical University of Darmstadt
2019
In this paper, we consider a multiple-input multiple-output wireless powered communication network, where multiple users harvest energy from dedicated power station in order to be able transmit their information signals an receiving station. Employing practical non-linear harvesting (EH) model, propose joint time allocation and control scheme, which takes into account the uncertainty regarding channel state (CSI) provides robustness against imperfect CSI knowledge. particular, formulate two...
Modern wireless sensing and communication systems are often based on high bandwidth carrier frequencies. In the range beyond 100 GHz, common receiver architectures, like active homodyne or heterodyne receivers, have an issue with amplification needed for mixing. Also, is a problem these systems. this context, six-port good alternative, just as well lowvolume markets. The concept additive superposition of two RF input signals using four different relative phases leading to constructive...
A novel remote respiration and heartbeat monitoring sensor is presented. The device a monostatic radar based on six-port interferometer operating continuous-wave signal at 24 GHz radiated power of less than 3 μW . Minor mechanical movements the patient's body caused by as well can be tracked analyzing phase modulation backscattered means microwave interferometry with network. High-distance measurement accuracy in micrometer scale low system complexity are benefits receiver. To verify...
Abstract This paper introduces heart sound detection by radar systems, which enables touch-free and continuous monitoring of sounds. The proposed measurement principle entails two enhancements in modern vital sign monitoring. First, common touch-based auscultation with a phonocardiograph can be simplified using biomedical systems. Second, detecting sounds offers further feasibility radar-based heartbeat To analyse the performance principle, 9930 seconds eleven persons-under-tests’ signs were...
Social bonds, maintained by mutual investments of time and energy, have greatly influenced the evolution social cognition cooperation in many species [e.g., 1-8]. However, there are two pitfalls regarding "social bonds" as an explanation for structure [1, 9-11]. First, studies often incorrectly assume that frequent association implies partner fidelity based on preference, but even seemingly complex nonrandom interaction networks can emerge solely from habitat or spatial [12-16]. Second,...
Abstract Using Radar it is possible to measure vital signs through clothing or a mattress from the distance. This allows for very comfortable way of continuous monitoring in hospitals home environments. The dataset presented this article consists 24 h synchronised data radar and reference device. implemented wave system based on Six-Port technology operates at GHz ISM band. device simultaneously measures electrocardiogram, impedance cardiogram non-invasive blood pressure. 30 healthy subjects...
We present the application of optical code division multiple access (OCDMA) modulation based on orthogonal codes for automotive time-of-flight light detection and ranging (LiDAR) system sensors using avalanche photodiode (APD) detectors. The opens possibility to discriminate single laser transmissions. This allows realization additional features like enhancing systems' interference robustness or accelerating their scanning rate. requirements LiDAR OCDMA differs from telecommunication's...
Modern society has shown a large demand for ubiquitous and wireless connectivity, information transmission with high data rates, precise sensors any kind of physical dimension. Nevertheless, the frequency spectrum is limited bandwidth restricted by regulatory issues. Over last few years, continuous rise in operating linked to rising been observed. For short-range operation, license-free industrial, scientific, medical (ISM) bands beyond 100 GHz are becoming more focus practical applications....
Recent advances in animal tracking technology have ushered a new era biologging. However, the considerable size of many sophisticated biologging devices restricts their application to larger animals, whereas older techniques often still represent state-of-the-art for studying small vertebrates. In industrial applications, low-power wireless sensor networks (WSNs) fulfill requirements similar those needed monitor behavior at high resolution and low tag mass. We developed network (WBN), which...
Industrial automation today is an essential technology underlying our modern society. Advanced positioning and sensor feedback tasks in processes often require distance displacement detection, e.g., to measure track the movement of robots. Furthermore, detection mechanical stress complex industrial machinery through accurate vibration analysis a task major interest. Therefore, high-resolution measurements with short- long-range are important for large number sensing applications can also be...
This letter describes the design and characterization of a linear polarized 6 × element transmitarray providing beam-steering range 100° at 24.6 GHz. The is formed unit cells continuous electronically reconfigurable phase 360° by using varactor diodes as tunable elements. cell consists four single RO4350B laminate layers. Unit have been characterized measurements showing good agreement with numerical results.
Female bats of temperate zones often communally rear their young, which creates ideal conditions for naive juveniles to find or learn about resources via informed adults. However, studying social information transfer in elusive and small-bodied animals the wild is difficult with traditional tracking techniques. We used a novel 'next-generation' proximity sensor system (BATS) investigate if how juvenile use acquiring access two crucial resources: suitable roosts food patches. By...
Objective: Radar technology promises to be a touchless and thereby burden-free method for continuous heart sound monitoring, which can used detect cardiovascular diseases. However, the first most crucial step is differentiate between high- low-quality segments in recording assess their suitability subsequent automated analysis. This paper gives comprehensive study on this task addresses specific characteristics of radar-recorded signals. Methods: To gather signals recorded from radar,...
Abstract Radar systems allow for contactless measurements of vital signs such as heart sounds, the pulse signal, and respiration. This approach is able to tackle crucial disadvantages state-of-the-art monitoring devices need permanent wiring skin contact. Potential applications include employment in a hospital environment but also home care or passenger vehicles. dataset consists synchronised data which are acquired using Six-Port-based radar system operating at 24 GHz, digital stethoscope,...
Contactless measurement of heart rate variability (HRV), which reflects changes the autonomic nervous system (ANS) and provides crucial information on health status a person, would provide great benefits for both patients doctors during prevention aftercare. However, gold standard devices to record HRV, such as electrocardiograph, have common disadvantage that they need permanent skin contact with patient. Being connected monitoring device by cable reduces mobility, comfort, compliance...
Displacement detection and vibration measurements are important requirements for automation mechanical stress diagnosis in diverse industrial environments. Laser interferometry is a widely used technique these kinds of since it features high-resolution, wide dynamic range frequency response. Another advantage the laser contactless diagnosis/sensing which allows remote operations. However this not suitable harsh environments instance with presence dust or fog occur several production sites....
Although a lot of research has been done into radar-based heartbeat detection over the past few years, it is still unknown which physiological effects truly underlie these measurement signals. This paper investigates cardiovascular system, as well due to antenna characteristics, and establishes connection variety signals that can be found in comparable publications. For first time, cause diverging signal shapes researched, revealing locally specific pulse wave curves named sphygmograms....
This paper investigates resource allocation for simultaneous wireless information and power transfer (SWIPT) downlink systems based on a non-linear energy harvesting model. The algorithm design is formulated as non-convex optimization problem the maximization of total harvested power. proposed formulation not only takes into account imperfect channel state (CSI) but also guarantees quality-of-service (QoS) transfer. A novel iterative to obtain globally optimal solution considered problem. In...
Vital parameters are key indicators for the assessment of health. Conventional methods rely on direct contact with patients' skin and can hence cause discomfort reduce autonomy. This article presents a bistatic 24 GHz radar system based an interferometric six-port architecture features precision 1 µm in distance measurements. Placed at 40 cm front human chest, it detects vibrations containing respiratory movements, pulse waves heart sounds. For extraction respiration rate, time-domain...
This paper presents a continuous wave (CW) radar system operating at the 61 GHz ISM (industrial, scientific and medical) band for contactless heart sound monitoring optimized use in clinical environment. Due to high temporal resolution, this allows an exact acquisition of rate variability (HRV). It can be mounted under bed long-term without disturbing patient. measurement is beneficial e.g. seizure disorders that detected based on HRV changes. basic principle optimizations necessary...
Monitoring the propagation of mechanical cardiac signals throughout body is crucial for assessing cardiovascular health. A common drawback current gold standard methods vital sign monitoring necessity continuous skin contact. Radar-based sensing offers a promising alternative by enabling contactless measurement activity, including heart sound signals. As previous research has primarily focused on deriving from proximal regions, insights into to peripheral areas are lacking. To address this,...